What is the second supported wavelength for multimode optical fiber in addition to 850nm?

The second supported wavelength for multimode optical fiber, alongside the primary wavelength of 850nm, is indeed 1300nm. Multimode optical fibers are designed to transmit signals over short distances using multiple light modes. The 850nm wavelength is commonly used for short-range applications, such as within a building, while 1300nm is used for slightly longer distances and provides better attenuation characteristics and higher bandwidth capabilities than 850nm.

At 1300nm, multimode fibers can support longer link lengths and improved performance due to lower modal dispersion. This reduces the spread of the light pulses over distance, which is particularly beneficial in larger installations where higher data rates are necessary. Overall, the presence of 1300nm as a supported wavelength enhances the versatility and application of multimode fibers for various networking needs, especially in campus environments and data centers where moderate distances must be accommodated efficiently.